JPH071187B2 - Gas meter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a gas meter, and more particularly to a bellows type gas meter.

These meters are known and one embodiment of which is described in British Patent No. 1508307. The meter essentially consists of two measuring spaces, each space divided by a deformable bellows into two measuring chambers. Each measuring chamber is equipped with an orifice for introducing and discharging the gas to be measured.

To synchronize the introduction and discharge of gas into each chamber with the device of the bellows, each bellows is equipped with a transmission system, which controls the distributor, which distributor has an orifice associated with each chamber, Periodically communicate with the gas inlet or gas outlet.

The distributor can be of the linear displacement type as described in the above-mentioned British patent, or it can be the rotary displacement type. In the latter case, the orifices associated with each chamber are arranged on a circular ring and the distributor rotates about the axis of this ring.

The distributor slides on a sliding surface provided with an orifice, and the seal between the distributor and the sliding surface depends only on the weight of the distributor and the gas pressure difference between the distributor and its outside. Given. In order to obtain good sealing as a requirement for high precision meters, the wear of the distributor surface in contact with the slip surface must be regular. However, in prior art systems, the drive means of the distributor creates an extra tilt torque on the distributor. That is, in addition to the rotational movement about the axis of the distributor perpendicular to the slip surface, the drive means applies a torque that tends to rotate the distributor about an axis perpendicular to its original axis of rotation. As a result, there is irregular wear on the bearing surface of the distributor, causing leaks and thus impeding the correct operation of the gas meter.

[Summary of Invention]

To overcome these deficiencies, it is an object of the present invention to provide a rotary distributor bellows type meter in which the means for rotating the distributor does not create tilt torque on the distributor.

Therefore, the meter according to the invention comprises a measuring unit,
This measuring unit comprises two measuring compartments, each compartment being divided by a deformable bellows into two measuring chambers and forming a distribution surface, with four orifices in each distribution surface, each orifice of said measuring chamber. At least two levers, a case adapted to communicate with each other, a distributor movably mounted on the distribution surface, and a transmission means for dynamically connecting the distributor to the bellows. A transmission unit having an assembly, the distributor being rotatably mounted and along its axis of rotation,
A cylindrical sleeve perpendicular to the distribution surface is included, and the transmission means includes a crank forming portion, the crank portion having free play in the sleeve and pivotable relative to the case. Has a hub attached to the first pivot shaft and a first pivot shaft that is arranged parallel to the hub and is offset from the hub. One end of the lever assembly is attached to the first pivot shaft, and the transmission means includes: Means for producing interlocking rotation of the crank forming portion and the distributor.

Thus, due to the play that exists between the distributor hub and sleeve, the tilt torque that tends to be transferred to the crank by the lever assembly is not transferred to the distributor itself.

Gas meter with four chambers, for example British Patent No. 1,508,
In the meter described in No. 307, the meter case is
It consists of a central block with a central core and two side covers. The outer periphery of each of the two bellows is held between the edge of the central block and the edge of one of the side covers. Further, if the central block has structural elements that define an internal passageway associated with two interior chambers (defined by the central block), then two exterior chambers (defined by two side covers). Some of the structural elements that define the combined internal passages form an integral part of the two side cover.

Such a construction of the meter case is complicated and cannot be assembled by automation means.

Accordingly, another object of the present invention is to provide a four-chamber gas meter having a specially constructed case that is easy to assemble, and allows assembly by automation means, especially when the case is made of heat-sealable plastic material. And there is.

Therefore, the gas meter according to the invention comprises a case comprising two measuring compartments each divided into two chambers by a deformable bellows and a distribution zone comprising four orifices each communicating with one of said chambers by an internal passage, A distributor movably mounted on the distribution area and a transmission means for dynamically connecting the distributor to the bellows, the transmission means including at least two sets of lever assemblies. In the meter, the case comprises a central block and two side covers fixed to the central block, and the central block defines all structural elements defining the internal passage. It is characterized by including.

Like the usual construction, this meter consists of a sealed outer casing A and a measuring unit B arranged in the casing A.
And an integrator C which enables a mechanical indication of the capacity measured by the measuring unit B.

The measurement unit B first includes a case D, and this case D
Includes a central block 1 and two side covers 2, 3. As shown in detail in FIGS. 6a to 6d, the central block 1
Is the central partition 1a arranged along the longitudinal section of the central block
It includes, the central block 1 has a bottom 1j substantially perpendicular to the central partition 1a, a second side wall 1 k. The upper part of the central block 1 is more complex and will be described further below. The covers 2 and 3 are welded to the connecting surfaces forming the edges of the bottom portion 1j, the side wall 1k, and the upper portion of the central block. For example, the joint surfaces 1c and 1d of the block 1 welded to the joint surfaces 2a and 3a of the covers 2 and 3 can be seen. This assembly consisting of a central block and side covers defines two spaces 4, 5 separated by a central partition 1a. These spaces are referred to below as partitions. As is known, each compartment 4 and 5 is a deformable bellows or septum.
It is divided into rooms. The section 4 is provided with a bellows 10 and the section 5 is provided with a bellows 11.
The compartment 4 is thus divided by the bellows 10 into chambers 6 and 7. In contrast to this, bellows 11 divides compartment 5 into two chambers 8 and 9.
Is divided into The outer periphery of each bellows is the central block 1
Inner shoulder on bottom 1j, side wall 1k and top
It is held between 1e and 1f and the clamps 12 and 13. The case D also has a distribution cover 14 on its upper part, which is welded or glued to the upper part of the central block 1. This will be described later.

The distribution cover 14 and the upper part of the central block 1 have internal passages 15, 1
It defines 6, 17 and 18. These members define a central exhaust passage 19, which is better shown in FIGS. 3b and 4. As seen in Figure 2,
The upper part 14b of the distribution cover 14 has four openings, which have the shape of four sectors 23, 24, 25 and 26 separated from each other by a radial sealing strip 14c. The cover upper portion 14b has a seating surface or a sliding surface, and the four openings described above are formed therein. Internal passage
Reference numerals 15 to 18 are configured to connect the chambers 6 to 9 to the openings 23 to 26, respectively. More specifically, the chambers 6, 7, 8 and 9 are in communication with the openings 23, 24, 25 and 26 by internal passages 15, 16, 17 and 18, respectively.

6a-6e, the passages 15-18
To better understand the design of. FIG. 6e shows that the upper part of the central block 1 has an upper wall 1m from which a plurality of orifices emerge, which are separated from each other by a partition element 80 parallel to the central partition 1a. Has been done. The distribution cover 14 is fixed to the free upper ends of these partition elements 80. These orifices form the ends of the passages 15-19. In Figure 6e,
These orifices are indicated by the corresponding passage numbers with a prime symbol. The purpose of the distribution cover 14 is to hermetically connect the orifices 15'-18 'to the fan openings 23-26.

FIG. 6d shows that the internal passage 17 is reduced to a hole 17 drilled in the upper wall 1m of the central block, which hole is the chamber 8 and the orifice 17 '.
And the internal passage 15 is also reduced to a hole 15 drilled in the upper wall 1m of the central block, which hole directly communicates the chamber 6 with the orifice 15 '. Indicates that. The central passage 19 is defined by a U-shaped partition 82, the upper end of which is connected to the upper edge of the central partition, at least part of its length, as shown in FIG. 6a.

FIG. 6b shows a passage connecting the chamber 9 and the orifice 18 ′ of FIG. 6e.
18 is defined by a sloping partition 84, which
It is shown connected to the partition element of Figure 6e surrounding the orifice 18 '.

FIG. 6c shows a first sloping partition 86 which extends from the central partition 1a to one of the partitioning elements surrounding the orifice 16 ′, the internal channel 16 communicating the chamber 7 with the orifice 16 ′ of FIG. It is shown to be defined by a second sloping partition 88 separate from the orifice 18 'and the partition element of Figure 6e surrounding the orifice 16'.

The above description given with respect to FIGS. 6a to 6e shows that, according to the main feature of the invention, all internal passages 15-18 and central passage 19 are defined by structural elements belonging to the central block 1. Show. The distribution cover 14 is designed to simply communicate the central block orifices 15'-18 'with the distribution openings 23-26. Therefore, the side covers 2 and 3 have no elements defining the internal passage.

The measuring unit also has a rotary distributor, generally indicated at 22. The lower side portion 22 'of the distributor 22 slides on the seat surface or sliding surface of the upper side surface 14b of the distribution cover 14. More specifically, the upper side 14b comprises the strips or ribs 14d shown in Figure 3b which cooperate with the lower side 22 'of the distributor 22 to provide the desired seal.
The distributor 22 consists of four sectors of a circle, these sectors being
Orifices 22c separated from each other by two flat areas 22b
And a flare-like area 22d. Each of these 4 areas is 9
It corresponds to an angle of 0 °. Also, the distributor is a hollow central area 2
2f, which communicates with hollow salient area 22d. An orifice 22c sequentially connects each fan-shaped opening to the outside of the central unit defined by casing A,
The flared area 22d and the central area 22f are designed to communicate the central passageway 19 with either fan-shaped opening while blocking the assembly from the outside of the measuring unit, and the flat area 22b.
It will be readily understood that the sequentially closes the fan openings.

As is known, the rotation of the distributor can suppress the introduction and discharge of gas into each measurement chamber.

Meters with four measuring chambers and a rotary distributor are known per se and are described, for example, in U.S. Pat. No. 3,161,049. Therefore, it is not necessary here to describe in detail the operation of a meter of this kind, ie the interrelationship between the position of the rotary distributor and the position of the bellows in the measuring chamber. All that is required is to cite the above mentioned literature.

As shown in more detail in FIG. 3b, the cranking member 21 is first provided in order to obtain synchrony between the movement of the bellows and the rotation of the distributor 22. The crank 21 can rotate about an axis 20 arranged along the geometric axis of the fan openings 23-26. Also, the crank hub is the distributor 22
Is engaged with the inside of the maribe 22 which is integral with the. The sleeve 22e is arranged along the geometric axis of the circular side surface of the distributor 22 and is in contact with the side wall 14b of the distributor cover 14. The crank hub 21e is freely engaged in the sleeve 22e with very little play, eg 1 / 10th of a millimeter. Located in the distribution cover 14, sleeve 22e
The sealing is performed by one of the circular strips 14d cooperating with the lower end of the. Further, the crank 21 has a gear 21c that drives the integrator C and a crank pin 21b that is offset with respect to the axis of the hub 21e, as described later. The crank 21 and the distributor 22 are rotated together by the cooperation of a ledge 21a provided in the crank 21 and a radial group 22a provided in the distributor 22.

Again referring to the bellows 10 and 11 shown in Figure 3a, these bellows have a plate 29,
It is held between 30 and the counter plates 31, 32.
Arms to the center of the plates 29 and 30 respectively
71 and 72 are pivotally attached. As is further apparent from FIG. 1, the other ends of the arms 71 and 72 are connected for rotation with the lower ends of the vertical shafts 33, 34. These shafts 34, 34 are pivotally mounted in a passage 35 provided in the central block 1. The shafts 33 and 34 sealingly penetrate through the central block 1 by means of a seal 36.

The upper ends of the shafts 33 and 34 rotate with the first levers 37 and 38, respectively. The average position of these levers makes a characteristic angle of 90 ° with respect to each other, and the length of these levers is such that the line passing through the end points of the arc created by rotating while making a characteristic angle of 90 ° is the distributor. Determined to intersect the 22 axes of rotation. This structure allows the use of only simple cracks. Lever 37 and 38 by the other end,
It is connected to the connecting rods 39 and 40 respectively. These connecting rods are mounted on the crank pin 21b.

Bellows 10 and 11 can be easily understood from the above description.
Movement of the shafts produces a corresponding rotational movement of the axes 33 and 34. The rotational movement of these axes is via lever assemblies 37/39 and 38/40
It produces a corresponding rotational movement of the distributor 20. Therefore, the introduction or exhaust of gas into chambers 6 and 9 is synchronized with the movement of the bellows. Moreover, such a drive system allows some lead to be taken. That is, before the bellows reaches the end of its stroke, gas is introduced into a chamber without using the stroke stop system. In this way, the final position of the bellows and thus also the effective volume of the chamber can be determined more accurately.

Referring to FIG. 3a, the outer casing a has two upper and lower parts.
It consists of one half casing 57 and 58. The upper half casing 58 includes a gas introduction nozzle 62 and a gas discharge nozzle 63. The gas discharge nozzle 63 goes through line 64 and also the distributor
Punchable area 65 ′ of distribution cover 14 outside 22 sweep areas
Through the orifice 65 of the inner central discharge passage 19.

Finally, the integrator C seen in FIG.
including. These drums consist of a set of gears 41, 43, 45 and
It is interlocked with the gear 21c of the crank 21 via 48. This needs no further explanation.

As another embodiment, the gap e between the sleeve 22e and the hub 21e may be made small, for example, on the order of 1 mm. Distributor under the rotating action of the crank 21
22 is rotated around a randomly varying axis because of such a non-narrow gap e . In this way the movement of the distributor is eccentric with respect to the axis of rotation of the hub 21e.

Therefore, the contact surface between the strip 14d of the distributor cover and the lower surface 22 'of the distributor 23 changes simultaneously with the rotation axis of the distributor 22. As a result, the wear of the lower side 22 'of the distributor 22 extends over a larger area of this lower side, this worn portion being determined by the gap e . Therefore, the wear of the lower surface 22 'of the distributor 22 becomes more regular.

The method for producing the rotation of the distributor must be described in more detail.

As described above, regarding the tilt torque applied to the distributor 22, in addition to the rotational movement of the distributor, the lever set 37
-39 and 38-40 are also responsible. According to the present invention, this tilting torque is applied to the assembly that comprises the crank 21. This inclination is due to the gap between the crank hub 21e and the distributor sleeve 22e, and because the connection between the crank 21 and the distributor 22 is made only by the cooperation of the trip 21a and the group 22a. Torque is applied to the crank but not to the distributor itself. In this way, regular wear occurs on the face of the distributor in contact with the sliding surface 14b.

In the embodiment specifically described with respect to FIG. 4, gas enters and exits the meter through the top of casing A. According to a feature of the invention, the meter allows gas to be introduced into the casing from the top of the casing in a conventional manner by simple processing and assembly operations, while the gas is substantially discharged from the bottom of the casing. Designed to be performed along the extension of the inlet. Therefore, the central block 1
And the side covers 2 and 3 are separated from the central passage 19 by a perforable thin partition 66, an internal passage 19 '(FIG. 4).
Is defined. This passage 19 'opens through an orifice 67 at the lower end of case D.

To obtain the gas access system of FIG.
It is obvious that the area 65 'may be perforated with an orifice 65, provided with an inlet nozzle 62 and an outlet nozzle 63 as shown in FIG. 4, and a line 64 may be installed.

In order to obtain the access system of FIG. 5, the thin partition 66 is removed without punching orifices in the distribution cover 14,
The internal passages 19 and 19 'are communicated with each other. Further, the introduction nozzle 68 is installed on the casing A. This nozzle 68 has the same role as the nozzle 62 of FIG. 4, and the discharge nozzle 69 is installed at the bottom of the casing A. Finally, the discharge nozzle 69 and the orifice 67 are connected by the line 70.

As is apparent from the above description, by manufacturing a unitary case, it is possible to obtain a meter with an introduction system and a discharge system by performing only a very limited number of special machining operations. In the case of the assembly shown in FIG. 4, the introduction cover 14
It is only necessary to drill an orifice in the area 65'of the. In the case of the assembly of FIG. 5, it is only necessary to remove the thin partition 66 that is easily accessible from the outside.

6d and 7, the preferred embodiment for mounting the block 1 around the bellows and the side cover will be described in detail when the meter case is made of plastic material.

Figure 6d shows that the side walls 1k, 1j, 1l of the central block 1 connected to the central partition 1a are attached to the side covers 2 and 3 by two.
It shows that it has joint surfaces 1c and 1d. These joint surface 1c
And 1d are not perfectly flat. Each joining surface is a flat portion 100 corresponding to most of the case bottom portion 1j and the case side surface 1k arranged on a surface parallel to the partition 1a, and a different surface parallel to the flat portion 100. And a second flat portion 102 arranged. This flat portion 102 is an upper side wall 1 to which the distribution cover 14 is fixed.
m corresponding to these flats 100 and 102
Are connected to each other by two curved portions 104 and 106.

The curved portions 104 and 106 are formed by a straight line that moves parallel to the central partition 1a and at a right angle to the upper wall 1m of the central block. As mentioned above, the central block 1 further comprises two shoulders 1e and 1f. These shoulders are flat and are arranged symmetrically in parallel to the central partition 1a. The surface of each shoulder is the first of the corresponding mating surfaces.
It is inside the flat part 100. Each shoulder 1e and 1f has a plurality of nipples 110 integrally cast with the central block 1. The surface of the shoulder 1f is arranged between the passage 17 corresponding to the chamber 8 and the starting point of the passage 18 corresponding to the chamber 9. The same arrangement is applied to the shoulder 1e.

FIG. 7 shows each stage of assembling the bellows and the side cover. First, one end of the arm 72 is pivotally mounted on the plate 30 which is integral with the bellows. Next, the bellows is placed on the shoulder 1f so that the nipple 110 enters into the hole 114 provided in the flat outer peripheral portion 112 of the bellows. Then the corresponding orifice 116
Install the clamp 13 equipped with. This clamp 13 is pressure-bonded on the outer periphery of the bellows, and ultrasonically deforms the head of the nipple 110, so that the outer periphery of the bellows on the shoulder 1f.
Stick 112 together.

The joint surface 3a of the side cover 3 shown in the upper part of FIG. 7 is joined to the joint surface 1d of the central block 1. More specifically, the joint surface includes a flat portion 120 corresponding to the portion 100 of the joint surface 1d of the central block 1 and a second flat portion 12 corresponding to the portion 102.
2 and curved portions 124 and 126 corresponding to the curved portions 104 and 106.

As shown in FIG. 7, the side cover 3 has a flat portion 128, which extends between the joint surface portion 122 and the inclined surface 130, and the inclined surface 130 connects the flat portion 128 to the joint surface. 3a part 12
Connected to 0. Further, the inclined surface 130 is limited by the curved portions 124 and 126 of the joint surface 3a.

The side cover 3 is fixed to the central block 1 by friction welding. Therefore, the cover 3 is arranged on the center block 1 so that the joint surface 3a of the cover 3 contacts the joint surface 1d of the center block 1. Next, the flat part of the cover 3
Relative oscillatory motion along the direction F perpendicular to the top 1 m of the center block is applied to the center block / side cover assembly while applying sufficient stress to 128. This is possible from the above definition for both mating surfaces.
The applied stress and relative oscillatory motion result in localized heating of the faying surfaces and thus welding. Of course, the cover 3 is made of a thermoplastic material which is similar or compatible with that used for the central block. In this way, a sealing bond between the central block 1 and the side covers 3 is obtained.

A similar method is used to join the bellows 10 and the side cover 2 to the shoulder 1e and the joining surface 1c of the central block, respectively.

The heat-sealable material is preferably fiberglass loaded butylene terephthalate polyester. The pressure applied at right angles to the cover is on the order of 700 daN. The vibration applied to the cover parallel to the faying surface has a frequency on the order of 200 Hz and a swing of 0.7-1.5 mm.

Such an embodiment of the case of a gas meter has many advantages over commonly used techniques. It should be noted that this embodiment of the case is used in exactly the same way for a four-chamber gas meter with a linear-moving or oscillating distributor.

Since the internal passages 15 to 18 which communicate each chamber with the distribution cover 14 and the central passage 19 are formed in the central block,
The sealing problem between the central block and the side cover is simplified. In fact, in designs where the side cover defines part of the internal passage, i.e. the internal passage in communication with the two outer chambers, special seals must be provided for these internal passages.

Further, the distance between the bellows attachment point on the center block and the side cover attachment point is larger than that in the prior art in which the outer periphery of the bellows is fixed between the edge of the center block and the edge of one side cover. , Substantially simplifies meter assembly and enables automation. In such prior art, extra thickness must be provided on the outer circumference of the bellows to allow a double seal between the bellows and the center block and side covers. On the contrary, according to the invention, it is possible to use friction welding, since there must be a direct seal between the central block and the side cover. This would not be possible if a seal had to be placed between these two parts.

Finally, the shape of the signed cover itself has two advantages over a flat cover design. Firstly, the presence of the ramps 130 allows the cover to be strengthened, and secondly, because of this same ramp, the lower half casing 57 with rounded corners that does not increase the external dimensions of the casing can be used, so that the meter can be used. The overall size of can be reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a gas meter according to the present invention, FIG. 2 is a plan view of the meter with the upper portion of the outer casing removed, and FIG. 3a is taken along the line AA of FIG. Fig. 3b is a vertical sectional view taken along a plane parallel to Fig. 1. Fig. 3b is a partial sectional view showing the mounting and driving of the rotary distributor in an enlarged manner. Sectional drawing, FIG. 5 is a view similar to FIG. 4, showing another embodiment of the introduction path and the discharge path for the gas flowing in and out of the meter casing, and FIG. 6a is the line VI-VI in FIG. 6b is a sectional view taken along the line BB of FIG. 6a, FIG. 6c is a sectional view taken along the line CC of FIG. 6a, and FIG. 6d is a sectional view of FIG. 6a. Sectional view taken along the line DD, FIG. 6e is a plan view of the central block of the meter case, and FIG. 7 is an exploded perspective view showing a method of assembling the bellows and the side cover on the central block. It is. A ... Casing, B ... Measuring unit, C ... Integrator, D ... Case, 1 ... Center block, 1a ... Center partition, 1e, 1f ... Shoulder, 1c, 1d, 2a, 3a ... Joint surface,
2, 3 ... Side covers, 4, 5 ... Compartments, 6, 7,
8, 9 ... Measuring instrument, 10, 11 ... Bellows, 12, 13 ... Clamp, 14 ... Distribution cover, 14d ... Circular rib, 15, 16, 1
7, 18 ... Passage, 15 ', 16', 17 ', 18' ... Distributing orifice, 19, 19 '... Internal passage, 20 ... Crankshaft, 21
…… Crank, 21a …… Business trip, 21b …… Crank pin, 21
c ... Gear, 21e ... Hub, 22 ... Distributor, 22a ... Groove hole, 22b ... Distributor flat part, 22c ... Distributor opening,
22d …… Sara-shaped part, 22e …… Sleeve, 37, 38, 39, 40…
… Crank lever, 65 ′, 66 …… Punchable partition, 67 ……
Orifice.

Claims (9)

[Claims] 1. A center block, four distributor orifices secured to the center block, a distributor cover defining a distributor surface, and also secured to the center block.
A case having two side covers defining respective inner compartments, two variable bellows mounted in each of the compartments to divide each compartment into two measuring chambers, and this measuring chamber And four internal passages formed in the central block and connected to respective distribution orifices, and a cylinder rotatably mounted on the distribution cover and arranged perpendicular to the distribution surface along the axis of rotation. A distributor having a shaped sleeve, and a transmission means, the transmission means being engaged in the sleeve with clearance and being rotatably mounted on the case, and parallel to the hub. A crank forming portion having a first pivot shaft disposed offset to the crank forming portion; and a bellows dynamically connected to the crank forming portion, and having at least two sets of lever assemblies. One end of the bar assembly has a connecting means attached to the first pivot shaft, and an interlocking rotating means for interlockingly rotating the crank portion and the distributor, wherein the clearance is the first pivot of the distributor. The size is such that it is possible to apply a rotational force to the interlocking rotating means while hardly moving along a plane perpendicular to the axis, and thus even if the first pivot shaft is tilted by applying a tilting torque. , The sleeve of the distributor does not come into contact with the first pivot shaft, so that no tilting torque is directly transmitted to the distributor, which makes it possible to even out the wear of the distributor. Meter. 2. The measuring chamber comprises two measuring compartments, each compartment being divided by a deformable bellows into two measuring chambers and forming a distribution surface in which four orifices are provided. A case provided with each orifice communicating with each of the measuring chambers through an internal passage, and a distributor rotatably mounted on the distribution surface, wherein the distributor is arranged along an axis of rotation of the distributor. A distributor including a cylindrical sleeve disposed perpendicular to a plane, a hub engaged in the sleeve with clearance and rotatably mounted to the case, and offset parallel to the hub. Forming part including a first pivot shaft arranged in an axial direction, means for dynamically connecting the bellows to the crank forming part, wherein one end of the lever assembly is attached to the first pivot shaft. And a means for interlocking rotation of the crank forming part and the distributor, wherein the clearance is interlocked while the distributor is hardly moved along a plane perpendicular to the first pivot axis. It is of a size that allows the rotating means to be given a rotational force, whereby the sleeve of the distributor does not contact the first pivot shaft even if the first pivot shaft tilts due to the tilt torque applied thereto. As a result, a gas meter with a measuring unit in which the tilting torque is not transmitted directly to the distributor and the wear of the distributor is even. 3. A second pivot shaft integral with the case, the second pivot shaft projecting outside of the distribution surface, the second pivot shaft being arranged along a rotational struggle of the distributor, and the hub being hollow. The gas meter according to claim 2, wherein the gas meter is rotatably mounted on the second pivot shaft. 4. The interlocking rotation means includes a protrusion integral with the crank portion, and a slot provided in the distributor for engaging the protrusion. The listed gas meter. 5. A gas meter according to claim 2 wherein said distribution surface includes circular sealing ribs cooperating with a distal end of said sleeve proximate said distribution surface. 6. Further comprising mechanical indicating means, wherein said crank portion comprises a portion of a gear co-axial with said hub and arranged at a right angle to said hub axis, said gear portion The gas meter according to claim 2, which drives the mechanical display means. 7. The gas meter according to claim 6, wherein the pivot shaft is a shaft integral with the gear portion. 8. The case further comprises a first passage and a second passage.
Forming a passage, opening the first passage to a distribution surface area swept by the distributor, one end of the second passage opening to an orifice at an end of the case opposite the distribution surface, Claims: The passages are separated from each other by a pierceable internal partition and have a pierceable area at the end of the area swept by the distributor to communicate the first passageway with the exterior of the case. The gas meter according to item 1. 9. A case comprising a center block, a distributor cover having four distributor orifices secured to said center block, and two side covers secured to said center block to define two interior compartments. And two deformable bellows mounted inside each of the compartments to divide each compartment into two chambers, for connecting each distribution orifice to the corresponding chambers formed in the central block. Four internal passages, a distribution assembly rotatably mounted on the distribution cover, and a transmission means for dynamically connecting the deformable bellows to the distribution assembly. The central block further has two shoulders arranged in parallel to each other and two joining surfaces spaced from these shoulders, the outer periphery of each bellows sealing on the shoulders. And each side cover has an edge portion provided with a joint surface, and these side covers are directly fixed to the center block via the joint surface, And the side cover, which is made of a heat-sealable material, is assembled by friction welding with each other, and has a measuring unit.